JLabel highlighting in crossword

Hey guys, Im programming a crossword in Java, I have finished GUI and everything, my crossword consists of two-dimensional array[][] of JLabels- cells.
Now i want to add a MouseListener that when i click on one cell in the crossword, it will change color. I know that JComponents haave setBackground(Color) method, but the problem is, that I dont know how to code which particular cell i clicked on.
Sorry for my English, hope u understood me.. :)